Quad Throttles

[spoonza6]

whats the advantage and possible gains of having quad throttles like in the pic below opposed to say just a normal custom made plenum? im thinking about changing to that if theres anything to gain. Its for a toyota gt starlet.

[Crampy]

Depending on the ECU, it can be easier to tune with a plenum rather than the quads.

[spoonza6]

im running a g3 link

[Crampy]

im running a g3 link

Hmmmm, I probably should have also said it depends on how good the tuner is too. With quads you'll need a vacuum accumulator and not take the MAP sensor signal from a single runner, as it'll make it hard to tune at idle, low loads etc.

[RomanV]

At full throttle it's nearly irrelevant where your throttle(s) are, because they're fully open.

You'll never make more power, just because you've got 4 throttles instead of 1.

The advantage is that there is a smaller volume of air in between the valves and the throttle(s), so throttle response is better.

For a turbo car, I wouldnt bother.
Even for an NA car, if the factory intake manifold is awesome, probably wouldnt bother either.

Lots of $$$$ for not much gain. Especially if it makes tuning your engine, and having idle speed control a pain in the arse.

[spoonza6]

ah ok, well the tuner is ezy10s so he's pretty damn good. if no real gains from it i might just get it cause it will look freakin kool

[RomanV]

So ask Glenn what he thinks either way, if he's the one tuning it...

My money's on him saying that it's not worth the trouble/cost.

[spoonza6]

well he reckons just get them cause its kool haha. I've got 2 starlets and the other is running a g4 so might get him to set it up on that and have a play with it.

[ezy10s]

yeah and im up for a challenge if nothing else!!!!

[Dell'Orto]

They're also quite good if you have big duration cams, helps stop intake pulse reversion messing with things.

[escortman]

o glenn my supra will hopefully be turbo in couple months so keep ya eye/ears peeled for a ecu for it chur

o my mate sold that 1g hilux new owner blew it up after couple weeks lol

soory hijacked haha

[ezy10s]

sweet man supra on!

[BZG Wagon]

At full throttle it's nearly irrelevant where your throttle(s) are, because they're fully open.

You'll never make more power, just because you've got 4 throttles instead of 1.

The advantage is that there is a smaller volume of air in between the valves and the throttle(s), so throttle response is better.

For a turbo car, I wouldnt bother.
Even for an NA car, if the factory intake manifold is awesome, probably wouldnt bother either.

Lots of $$$$ for not much gain. Especially if it makes tuning your engine, and having idle speed control a pain in the arse.

Why did Toyota bother with Quad Throttles on the BZ Wagons? Marketing reasons?

[RomanV]

I wouldnt think so.

That would be an expensive marketing exercise, for something that people cant really see or know what it does, tucked away in an engine bay.

I could only guess why Toyota made a 5 valve per cylinder engine with factory quad throttles. Got to be notably more expensive/complicated to produce than just 16v and single throttle.

Some people say as the homologation base for some race class? I dont know.

But I guess it makes sense that if spending all of the R&D on developing an engine like that, they would want to use it on as many platforms as possible to justify costs.

I guess kinda like how Toyota put a 1G of all things in an Altezza, probably just to use up a bunch of old cranks and engine blocks and what not they had kicking around from 10 years ago

[touge_ae101]

I wouldnt think so.

That would be an expensive marketing exercise, for something that people cant really see or know what it does, tucked away in an engine bay.

I could only guess why Toyota made a 5 valve per cylinder engine with factory quad throttles. Got to be notably more expensive/complicated to produce than just 16v and single throttle.

Some people say as the homologation base for some race class? I dont know.

But I guess it makes sense that if spending all of the R&D on developing an engine like that, they would want to use it on as many platforms as possible to justify costs.

I guess kinda like how Toyota put a 1G of all things in an Altezza, probably just to use up a bunch of old cranks and engine blocks and what not they had kicking around from 10 years ago

you'd be suprised. but toyotas manufacturing methods are nowhere near as crude as the americans. where they end up having heaps of inventory lying around. in the late 80's toyota revolutionised the manufacturing world by developing a form of Lean Manufacturing loosely called the 'can ban' system. which looks at inventory as a negative so toyota would only produce engines etc for cars they had orders for. with a week or so allowance for breakdown. it is also known as 'just in time' manufacturing.

i can never understand the 1G in the altezzas but in terms of quad throttles in the BZ wagon, it is all a matter of standardising every application. it would of been cheaper for them to stick the 20V and quadthrottles in the BZ rather than having to develop a variation of the loom, ecu fitment etc etc. which would have meant a small amount of re-tooling and variations to their production system.

[spencer]

Re the 1G, its just another engine option that means they can sell the car to a different market for cheaper, not everyone wants a 3S screamer or a expensive lexus 2jz option. The modern 1G is allot different to the old version block is different and obviously VVTi heads (which have really awesome ports BTW). Plus its used across the board as a budget entry level engine in crowns, Mark 2's etc.

Biggest advantage I see on a N/A application for individual throttles is for intake length tuning. Plus as mentioned with big cams an engine will run sooo much better with throttles. Every serious NA engine will have individual throttle bodies, look at bikes, race engines etc